Dummy questions on GCC internals

[Alexander Aganichev]

Hi!

I have some dummy questions:-)

Is there a guide with GCC internal errors explanation? I'm in
progress of defining z80.md file and receive various
complaints like "Unrecognizable insn". How can I determine
what's wrong?

Another problem is "Internal error: abort in
find_matching_operand" in genrecog. I'm sure it's my fault,
but is there easy way to find it out?

Also, what is the major difference between define_insn and
define_expand ending with DONE?

Thanks in advance.

--
Alexander Aganichev

url: http://aaganichev.narod.ru
e-mail: aaganichev@yandex.ru
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